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Mesocambrian
Mesocambrian n. and adj. 
/ˌmɛzə(ʊ)ˈkambrɪən/, /ˌmiːsə(ʊ)ˈkambrɪən/, /ˌmiːzə(ʊ)ˈkambrɪən/, /ˌmɛsoʊˈkæmbriən/ Geology (now historical) (a) n. the middle epoch of the Cambrian period; (b) adj. of or relating to this epoch (rare).Sense (b) is apparently only attested in dictionaries or glossaries.
Brit. /ˌmɛsə(ʊ)ˈkambrɪən/
, /ˌmɛsə(ʊ)ˈkambrɪən//ˌmɛzə(ʊ)ˈkambrɪən//ˌmiːsə(ʊ)ˈkambrɪən//ˌmiːzə(ʊ)ˈkambrɪən/U.S. /ˌmɛzoʊˈkæmbriən/
, /ˌmɛzoʊˈkæmbriən//ˌmɛsoʊˈkæmbriən/ΚΠ
1894 H. S. Williams in Jrnl. Geol. (Chicago) 2 157 I would propose that we subdivide the eras into Periods..thus: the Eocambrian,..the Mesocambrian, or the period of the Paradoxides fauna,..and in the same manner for each of the other eras.
1906 N.E.D. at Meso- Mesocambrian a. and sb.
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